1 /*-
2 * Copyright (c) 1999, 2000 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #ifndef RTLD_MACHDEP_H
30 #define RTLD_MACHDEP_H 1
31
32 #include <sys/types.h>
33 #include <machine/atomic.h>
34
35 struct Struct_Obj_Entry;
36
37 /* Return the address of the .dynamic section in the dynamic linker. */
38 #define rtld_dynamic(obj) \
39 ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
40
41 /* Fixup the jump slot at "where" to transfer control to "target". */
42 static inline Elf_Addr
reloc_jmpslot(Elf_Addr * where,Elf_Addr target,const struct Struct_Obj_Entry * obj,const struct Struct_Obj_Entry * refobj,const Elf_Rel * rel)43 reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
44 const struct Struct_Obj_Entry *obj,
45 const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel)
46 {
47 #ifdef dbg
48 dbg("reloc_jmpslot: *%p = %p", (void *)(where),
49 (void *)(target));
50 #endif
51 (*(Elf_Addr *)(where) = (Elf_Addr)(target));
52 return target;
53 }
54
55 #define make_function_pointer(def, defobj) \
56 ((defobj)->relocbase + (def)->st_value)
57
58 #define call_initfini_pointer(obj, target) \
59 (((InitFunc)(target))())
60
61 #define call_init_pointer(obj, target) \
62 (((InitArrFunc)(target))(main_argc, main_argv, environ))
63 #define calculate_first_tls_offset(size, align) \
64 roundup2(size, align)
65 #define calculate_tls_offset(prev_offset, prev_size, size, align) \
66 roundup2((prev_offset) + (size), align)
67 #define calculate_tls_end(off, size) (off)
68
69 typedef struct {
70 unsigned long ti_module;
71 unsigned long ti_offset;
72 } tls_index;
73
74 struct tls_tcb;
75
76 extern void *__tls_get_addr(tls_index *ti);
77 extern void *__tls_get_addr_tcb(struct tls_tcb *tcb, tls_index *ti);
78
79 #define RTLD_DEFAULT_STACK_PF_EXEC PF_X
80 #define RTLD_DEFAULT_STACK_EXEC PROT_EXEC
81
82 #endif
83